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As njd pointed out, most cell phone batteries are Lithium Ion now.
Although constant charging cannot hurt, it looks like you may want to periodically run the battery all the way down so the digital circuits can correctly calibrate:
Although lithium-ion is memory-free in terms of performance deterioration, batteries with fuel gauges exhibit what ...

A computer USB port is limited to 500 milliamperes (or 900 mA for a USB 3.0 port). The dedicated wall charger, on the other hand, is usually able to provide 1000 mA or more.
Let's take the case where a connected phone uses 200 mA. Then, the USB port would have 300 mA left to charge the battery while the wall USB charger would have 800 mA left. A typical ...

Lies, damned lies, and equipment specs. I can print up a lovely sticker that says it'll output 1000A. Doesn't mean it'll output that.
It's significantly cheaper to make a low-power supply than it is to make a high-power power supply. Making the latter means you need a bigger transformer (with heavier windings), larger capacitor(s), larger inductor(s) and ...

All newer phones use Lithium polymer batteries.
Why is it Partially Charged?
To decrease their aging they are intended to be stored at 40% charge. This means when you receive your phone it should be at 40% charge, otherwise they will have aged your battery for you. (you are probably used to the effects of aging, like a 2 year old phone seeming to have very ...

From what I can find, there is no way to turn it off:
no solution in the samsung galaxy s forum
no solution in the vodafone forum
Tasker can't suppress it
However, one commenter notes
Some custom ROMs rebuild the framework and rip the notification out entirely.
Check out the XDA forums if you'd like to try that stuff.
Typically requires root and a ...

Aside from the actual power provided, there's another variable: Whether the device RECOGNIZES that the charger is capable of putting out the rated amps.
Devices have some different strategies for recognizing what rating a charger has. Now when connected to a computer, it's easy - the numbers come across during USB enumeration. But when connecting to a dumb ...

I don't see how the duration of the charge would relate to whether or not it's harmful to the smartphone. I have never seen any documentation that keeping a phone plugged in perpetually (whether plugged into USB, AC or DC) would cause any harm to the phone itself. An argument could be made that it's harmful to the battery.
Constant charging is not ...

I doubt that there is a direct correlation between battery consumption and RAM usage. The hardware doesn't know which RAM cells contain 'used' data and which not. So there can be no difference in battery consumption on that level.
But I think that one could say that unnecessarily killing Apps causes a few extra CPU cycles when those Apps have to be ...

Every mobile battery has an inbuilt thermistor, (which is a transducer which varies its resistance with respect to its temperature) with which the charging circuit constantly measures the battery temperature. It can even prevent charging the battery if the temperature reaches dangerous level and by controlling its temperature, the life of battery is ...

Try pressing the power button for > 30 seconds.
If it does not work, try to alternate power sources (PC/laptop USB port, and AC adapter) while repeating step #1.
Still no go? You may have to remove back cover and reconnect battery.
Warranty case.
(source)

Modern phones use Li-ion and Li-poly batteries. So the battery life is not affected by whether you charge them at 0% or 90%.
It only has a long term effect. Batteries degrade with every charge cycle. A cycle is usually a recharge from below 50%. So charging while the battery capacity is still relatively high has a long term effect of less degradation.
...

Think of RAM like a paper notebook. You can write data into the book (with a pencil), and you can erase those data and replace them with new data, but the book's always the same weight. The book doesn't get any heavier, whatever you write in it. The same way, with current RAM technology, the battery use of the RAM is fixed, regardless of what (if anything) ...

Set the global notifications to silent.
Set the notification on messaging to any ringtone (not default).
Repeat (2) for any other app you want notifications for.
You'll still have a tone when you 1st plug the phone in to the charger, but no tone when it's fully charged. Of course, this isn't a perfect solution since you need to manually set every other ...

As soon and as often as you can. Spending time at any extreme of charge (high or low) can damage lithium batteries. High charge isn't that bad, considering how quickly modern devices will drain away from that state. Spending time at lower charge levels will damage the internal structure of the battery though.
Draining to "0" on the device won't actually ...

HTC's solution to this issue is to "Press and hold the Power button for at least 10 seconds, and then release it. HTC One X will be shutdown and then boot again."
This is the only solution I would be able to see. If you require something more, then as a phone modder I would recommend you take apart the phone and manually disconnect the battery. This is ...

Android assigns each application a UID (User ID) at install time; unlike PID (Process ID) which is transient and keeps changing all the time, UID stays constant as long as the application is not reinstalled. The UID should be unique to each application, except when the application explicitly requests to share a userid with another application (there are ...

Connector A seems a U.FL-R-SMT-10 and probably is for an external/additional antenna.
U.FL, is a miniature coaxial RF connector for high-frequency signals
up to 6 GHz manufactured by Hirose Electric Group in Japan.1 U.FL
connectors are commonly used inside laptops and embedded systems to
connect the Wi-Fi antenna to a Mini PCI card. Female U.FL ...

I think you answered your own question ;)
Navigation uses a lot of power: it needs constant use of GPS along with reading the map and processing text to speech. Throw in another power-intensive activity like bluetooth or the phone's speaker (or calling, or data, etc), and it's very conceivable that it would drain power faster than it can pull it from a ...

It's device dependent, if the manufacturer can fit in the circuitry to use the wall charger without the battery then yes you'd be able to do that. Most laptops can run without batteries, I doubt many smartphone does though; phones are primarily designed to be used while on the go, while laptops are more likely to be plugged in.
A safe test is to shutdown ...

It is not uncommon that rejected/refurbished phones find their way back to the market as "new" ones.
But in my (and at least Al Everett's) experience, batteries are almost always shipped with some charge. I wouldn't worry, as long as there are no other indicators that your device was pre-owned.

The outer pins of a standard USB connector are used for power. You could try removing them from your cable, leaving only the inner data pins.
For more info on the pins, see http://pinouts.ru/Slots/USB_pinout.shtml. For more info on battery life, see Does constant charging harm my Android cellphone?

No app can "optimize" or "maintain" the battery in any way as it can't get the necessary access to the hardware -- probably not even if it required root. This app explicitly advertises that it does not. Anyway, the manufacturer's engineers surely have already implemented all the necessary optimizations. There is no way that the app's developers knows ...

once or twice a month a full battery drain and then a 100% charge helps increase the battery life
That is incorrect, a full discharge is never beneficial to LiON battery capacity. The battery life of a LiON battery is dependant mostly on temperature, discharge rate, and age. In fact, low charge state actually is harmful to LiON battery capacity; ...

Yes, using Tasker.
See "Set Wallpaper" action and "Power" state. It even looks like it'd be rather easy to configure that event.
For your related notes, also see "Airplane Mode" state and %SILENT variable.

As @Axeman said, the connector is an Ultra Small Surface Mount Coaxial connector (quite a mouthful and still could not get how it was abbreviated as U.FL) which is a kind of expansion port which could be used for any radio communication, including GSM, WiFi, GPS.
And as @Lie Ryan said, the fourth terminal in the battery is for connecting the antennae in the ...

Any Micro USB cable that has the capability of charging your phone does excactly that.
I found a link on USB powering. The source is from 2005 but the issue remains the same.
Some cables do charge your device due to a sufficient power flow through the cable while others don't.